EP3164268B1 - Droplet deposition apparatus - Google Patents

Droplet deposition apparatus Download PDF

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Publication number
EP3164268B1
EP3164268B1 EP15736025.6A EP15736025A EP3164268B1 EP 3164268 B1 EP3164268 B1 EP 3164268B1 EP 15736025 A EP15736025 A EP 15736025A EP 3164268 B1 EP3164268 B1 EP 3164268B1
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EP
European Patent Office
Prior art keywords
array
flow restrictor
chambers
fluid
restrictor passage
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EP15736025.6A
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German (de)
English (en)
French (fr)
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EP3164268A1 (en
Inventor
Simon James HUBBARD
Christopher James GOSLING
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Xaar Technology Ltd
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Xaar Technology Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2/14201—Structure of print heads with piezoelectric elements
    • B41J2/14209—Structure of print heads with piezoelectric elements of finger type, chamber walls consisting integrally of piezoelectric material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
    • B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
    • B41J2/01—Ink jet
    • B41J2/135—Nozzles
    • B41J2/14—Structure thereof only for on-demand ink jet heads
    • B41J2002/14419—Manifold
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/10—Finger type piezoelectric elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J2202/00—Embodiments of or processes related to ink-jet or thermal heads
    • B41J2202/01—Embodiments of or processes related to ink-jet heads
    • B41J2202/12—Embodiments of or processes related to ink-jet heads with ink circulating through the whole print head

Definitions

  • the present invention relates to droplet deposition apparatus. It may find particularly beneficial application in a drop-on-demand ink-jet printhead, or, more generally, in droplet deposition apparatus and, specifically, in droplet deposition apparatus comprising: an array of fluid chambers, each chamber being provided with a nozzle and at least one piezoelectric actuator element operable to cause the release, on demand, of a droplet of fluid from the chamber through the nozzle, the array extending in an array direction; a common inlet manifold extending substantially the length of said array and being elongate in said array direction, for supplying fluid to said array of chambers; and a common outlet manifold extending substantially the length of said array and being elongate in said array direction, for receiving fluid from said array of chambers.
  • droplets of ink may travel to, for example, a paper or other media, such as ceramic tiling, to form an image, as is the case in inkjet printing applications; alternatively, droplets of fluid may be used to build structures, for example electrically active fluids may be deposited onto media such as a circuit board so as to enable prototyping of electrical devices, or polymer containing fluids or molten polymer may be deposited in successive layers so as to produce a prototype model of an object (as in 3D printing).
  • Droplet deposition apparatus suitable for such alternative fluids may be provided with modules that are similar in construction to standard inkjet printheads, with some adaptations made to handle the specific fluid in question.
  • WO 00/38928 provides a number of examples of droplet deposition apparatus having an array of fluid chambers, with each chamber communicating with an orifice for droplet ejection, with a common fluid inlet manifold and with a common fluid outlet manifold and where there is during use, a fluid flow into the inlet manifold, through each chamber in the array and into the outlet manifold.
  • Figure 1 illustrates a "pagewide" printhead 10, having two rows of nozzles 20, 30 that extend in an array direction (indicated by arrow 100) the width of a piece of paper and which allow ink to be deposited across the entire width of a page in a single pass. Ejection of ink from a nozzle is achieved by the application of an electrical signal to actuation means associated with a fluid chamber communicating with that nozzle, as is known e.g. from EP-A-0 277 703 , EP-A-0 278 590 , WO 98/52763 and WO 99/19147 .
  • piezoelectric actuator walls may be formed between successive channels and are actuated by means of electric fields applied between electrodes on opposite sides of each wall so as to deflect transversely in shear mode.
  • the resulting pressure waves generated in the ink or other fluid cause ejection of a droplet from the nozzle.
  • the "pagewide" row(s) of nozzles may be made up of a number of modules, one of which is shown at 40, each module having associated fluid chambers and actuation means and being connected to associated drive circuitry (integrated circuit ("chip") 50) by means e.g. of a flexible circuit 60.
  • Ink supply to and from the printhead is via respective bores (not shown) in end-caps 90.
  • FIG 2 is a perspective view of the printhead of Figure 1 from the rear and with end-caps 90 removed to reveal the supporting structure 200 of the printhead incorporating ink flow passages, or manifolds 210,220,230 extending the width of the printhead.
  • each of the manifolds is a chamber that is elongate in the array direction, indicated by 100 in Figure 1 ; this arrangement provides a particularly compact printhead construction.
  • WO 00/38928 teaches that ink may be fed into an inlet manifold and out of an outlet manifold, with the manifolds being common to and connected via each channel, so as to generate ink flow through each channel (and thus past each nozzle) during printhead operation. This may act to prevent the accumulation of dust, dried ink or other foreign bodies in the nozzle that would otherwise inhibit ink droplet ejection.
  • ink enters the printhead of Figures 1 to 4 via a bore in one of the end-caps 90 (omitted from the views of Figures 1 and 2 ), and via the inlet manifold 220, as shown at 215 in Figure 2 .
  • inlet manifold 220 As it flows along the length of the inlet manifold 220, it is drawn off into respective ink chambers, as illustrated in Figure 3 , which is a sectional view of the printhead taken perpendicular to the direction of extension of the nozzle rows.
  • ink flows into first and second parallel rows of ink chambers (indicated at 300 and 310 respectively) via aperture 320 formed in structure 200 (shown shaded).
  • ink exits via apertures 330 and 340 to join the ink flow along respective first and second ink outlet passages 210,230, as indicated at 235.
  • first and second ink outlet passages 210,230 join at a common ink outlet bore (not shown) formed in the end-cap and that may be located at the opposite or same end of the printhead to that in which the inlet bore is formed.
  • Each row of chambers 300 and 310 has associated therewith respective drive circuits 360,370.
  • the drive circuits are mounted in substantial thermal contact with that part of structure 200 acting as a conduit and which defines the ink flow passageways so as to allow a substantial amount of the heat generated by the circuits during their operation to transfer via the conduit structure to the ink.
  • the structure 200 is made of a material having good thermal conduction properties. WO 00/38928 teaches that aluminium is a particularly preferred material, on the grounds that it can be easily and cheaply formed by extrusion.
  • Circuits 360,370 are then positioned on the outside surface of the structure 200 so as to lie in thermal contact with the structure, thermally conductive pads or adhesive being optionally employed to reduce resistance to heat transfer between circuit and structure.
  • FIG 4 is a sectional view taken along a fluid chamber of a module 40.
  • channels 11 are machined or otherwise formed in a base component 860 of piezoelectric material so as to define piezoelectric channel walls which are subsequently coated with electrodes, thereby to form channel wall actuators, as known e.g. from EP-A-0 277 703 .
  • Each channel half is closed along a length 600,610 by respective sections 820,830 of a cover component 620 which is also formed with ports 630,640,650 that communicate with fluid manifolds 210,220,230 respectively.
  • Each half 600,610 of the channel 11 thus provides one fluid chamber.
  • a break in the electrodes at 810 allows the channel walls in either half of the channel to be operated independently by means of electrical signals applied via electrical inputs (flexible circuits 60).Ink ejection from each channel half is via openings 840,850 that communicate the channel with the opposite surface of the piezoelectric base component to that in which the channel is formed. Nozzles 870,880 for ink ejection are subsequently formed in a nozzle plate 890 attached to the piezoelectric component.
  • the large arrows in Figure 4 illustrate (from left to right): the flow of fluid from the chambers on the left-hand-side of the array 600 to outlet manifold 210, via the left-hand port 630; the flow of fluid into the channels from inlet manifold 220, via the central port 640; and the flow of fluid from the chambers on the right-hand-side of the array 610 to the other outlet manifold 230, via the right-hand port 650.
  • WO 00/38928 teaches that this ink flow through each channel (and thus past each nozzle) during printhead operation may act to prevent the accumulation of dust, dried ink or other foreign bodies in the nozzle that would otherwise inhibit ink droplet ejection. More, WO 00/38928 teaches that, to ensure effective cleaning of the chambers by the circulating ink and in particular to ensure that any foreign bodies in the ink, e.g. dirt particles, are likely to go past a nozzle rather than into it, the ink flow rate through a chamber must be higher than the maximum rate of ink ejection from the chamber and may, in some cases, be ten times that rate.
  • Figures 5 and 6 are exploded perspective views (taken from WO 01/12442 ) of a printhead having similar features as that shown in Figures 1 to 4 .
  • WO 01/12442 provides further examples of droplet deposition apparatus having an array of fluid chambers, with each chamber communicating with an orifice for droplet ejection, with a common fluid inlet manifold and with a common fluid outlet manifold and where there is, during use, a fluid flow into the inlet manifold, through each chamber in the array and into the outlet manifold.
  • Figures 5 and 6 illustrate in detail how various components may be arranged on a substrate 86, together with constructional details of the substrate 86 itself.
  • Figures 5 and 6 illustrate two rows of channels spaced relative to one another in the media feed direction.
  • the two rows of channels are formed in respective strips of piezoelectric material 110a, 110b, which are bonded to a planar surface of substrate 86.
  • Each row of channels extends the width of a page in a direction transverse to the media feed direction.
  • electrodes are provided on the walls of the channels, so that electrical signals may be selectively applied to the walls.
  • the channel walls may thus act as actuator members that can cause droplet ejection.
  • Substrate 86 is formed with conductive tracks 192, which are electrically connected to the respective channel wall electrodes, (for example by solder bonds), and which extend to the edge of the substrate (86) where respective drive circuitry (integrated circuits 84) for each row of channels is located.
  • a cover member 420 is bonded to the tops of the channel walls so as to create closed, "active" channel lengths which may contain pressure waves that allow for droplet ejection. Holes are formed in cover member 420 that communicate with the channels to enable ejection of droplets. These holes in turn communicate with nozzles (not shown) formed in a nozzle plate 430 attached to the planar cover member 420.
  • nozzles not shown
  • the substrate 86 is provided with ports 88, 90 and 92, which communicate to inlet and outlet manifolds.
  • the inlet manifold may be provided between two outlet manifolds, with the inlet manifold thus supplying ink to the channels via port 90, and ink being removed from the two rows of channels to respective outlet manifolds via ports 88 and 92.
  • the conductive tracks 192 may be diverted around the ports 88, 90 and 92.
  • the ports 90 communicating with the inlet manifold are arranged as an array that extends parallel to the direction of the nozzle rows (the array direction); similarly, the ports 88 communicating with the left-hand outlet manifold 210 and the ports 92 communicating with the right-hand outlet manifold 230 are arranged in respective arrays also extending parallel to the array.
  • These arrays of ports 88, 90, 92 assist in changing the direction of the flow from one generally parallel to the nozzle row, or array direction, to one generally perpendicular to the array direction and therefore directed along the lengths of the fluid chambers.
  • droplet deposition apparatus it is generally desirable to improve the uniformity over the length of the array of the droplets deposited; this is particularly the case with droplet deposition apparatus that have a large array of fluid chambers, such as inkjet printers.
  • droplet deposition apparatus that have a large array of fluid chambers, such as inkjet printers.
  • media is indexed past the array of fluid chambers to produce a pattern of droplets on the media (for example forming an image on a sheet of paper or a ceramic tile)
  • a pattern of droplets on the media for example forming an image on a sheet of paper or a ceramic tile
  • such non-uniformity over the length of the array may be particularly visible, since it will produce generally linear defects extending in the direction of substrate movement, the human eye being particularly adept at identifying such linear features.
  • the pattern formed is not intended to be viewed by the human eye (such as where electrically active fluids are deposited onto media such as a circuit board so as to enable prototyping of electrical devices, or polymer containing fluids or molten polymer may be deposited in successive layers so as to produce a prototype model (so-called 3D printing)), or where the media is not indexed past the array, it will still be appreciated that non-uniformity over the length of the array will be a concern.
  • WO 2007/006618 A1 discloses an inkjet print head having an ink chamber and a nozzle plate closing the ink chamber at an end comprising a nozzle for ejecting a drop of ink through it.
  • the nozzle plate further includes an ink path for flowing an ink through in a direction parallel with the nozzle plate and passing the inner end of the nozzle. This ink flow is in excess of that required for replenishing the ejected drops of ink in the ink chamber and may flow continuously past the inner end of the nozzle and along the ink path to refresh the ink that is used for ejecting through the nozzle.
  • Embodiments of the present invention may therefore exhibit improved uniformity in droplet deposition over the array of fluid chambers. However, it should be noted that further and/or other advantages may stem from embodiments of the present invention.
  • the present invention is a droplet deposition apparatus as defined in Claim 1 of the appended claims. Details of particular embodiments are set out in the appended dependent claims.
  • a droplet deposition apparatus comprising: an array of fluid chambers, each chamber being provided with a nozzle and at least one piezoelectric actuator element operable to cause the release, on demand, of a droplet of fluid from the chamber through the nozzle in an ejection direction, the array extending in an array direction, substantially perpendicular to said ejection direction; a common inlet manifold extending at least substantially the length of said array and being elongate in said array direction, for supplying fluid to said array of chambers; a common outlet manifold extending at least substantially the length of said array and being elongate in said array direction, for receiving fluid from said array of chambers; and a first flow restrictor passage connecting said array of chambers to one of said common inlet manifold and said common outlet manifold, so as to enable, respectively: a flow of fluid during use of the apparatus along the length of said common inlet manifold, through said first flow restrictor passage, then through said
  • the Applicant has identified variation in flow distribution over the length of the array as being a factor that may have a significant effect upon the uniformity of the droplets deposited by the array. More particularly, in apparatus where there is a common inlet manifold extending substantially the length of said array and being elongate in said array direction, for supplying fluid to said array of chambers and a common outlet manifold extending substantially the length of said array and being elongate in said array direction, for receiving fluid from said array of chambers, the flow of fluid within such common manifolds will generally be parallel to the array direction. However, if the flow adjacent the array of fluid chambers is also generally parallel to the array direction, the distribution of the flow over the chambers within the array may be poor. Measures have therefore been taken in prior art constructions to alter the direction of the flow adjacent to the array of chambers so that it is closer to perpendicular to the array direction.
  • WO 01/12442 provides arrays of ports 88, 90, 92 that assist in changing the direction of the flow from one generally parallel to the nozzle row, or array direction, to one generally perpendicular to the array direction and therefore directed along the lengths of the fluid chambers.
  • drawbacks exist with such constructions; in particular, the chambers closest to the ports 88, 90, 92 are found to generally receive relatively more flow, whereas the chambers more distant to the ports 88, 90, 92 are found to generally receive relatively less flow.
  • the flow distribution may be relatively sensitive to variations in the size and/or shape of the ports 88, 90, 92.
  • the overall construction may be relatively complex and costly to produce, involving a number of separate components that must be assembled.
  • porous sheet, or other porous elements taught by the document may progressively and irreversibly block up with particles suspended within the fluid (for example, in the case of ink, pigment particles), with these particles becoming lodged within and on the surfaces of the porous element.
  • the overall construction may be relatively complex and costly to produce, involving a number of separate components that must be assembled.
  • providing a porous element that is sufficiently robust and homogenous may be challenging in practice.
  • the first flow restrictor passage presents sufficient impedance to fluid flow such that, in use, fluid within the first flow restrictor passage adjacent said array of chambers is directed generally perpendicular to the array direction at substantially all the chambers within the array.
  • the first flow restrictor passage extends substantially the length of said array in said array direction, there may be less local variation in flow rates, as compared to the constructions disclosed in WO 00/38928 , where ports are utilised.
  • manufacturing a passage and specifically a passage that extends substantially the length of the chamber array may be relatively straightforward (for example by machining or moulding components). More generally, manufacturing apparatus according to the present invention may involve the assembly of fewer and/or less costly components.
  • the flow restrictor passage may described as being connected directly to both the array of fluid chambers and one of the common inlet manifold and the common outlet manifold. Hence, or otherwise, one end of the flow restrictor passage may open into said of the common inlet manifold and the common outlet manifold, while the other end of the flow restrictor passage may open into the array of fluid chambers.
  • the flow restrictor passage may have the same cross-section for substantially its whole length in the array direction. Such embodiments may be particularly straightforward to manufacture and may provide particularly consistent behaviour over its length in the array direction in terms of modifying fluid flow.
  • a droplet deposition apparatus comprising: an array of fluid chambers, each chamber being provided with a nozzle and at least one piezoelectric actuator element operable to cause the release, on demand, of a droplet of fluid from the chamber through the nozzle in an ejection direction, the array extending in an array direction, substantially perpendicular to said ejection direction; a common inlet manifold for supplying fluid to said array of chambers, the common inlet manifold extending substantially the length of said array and being elongate in said array direction, so as to enable a flow of fluid during use of the apparatus along the length of said common inlet manifold; and a flow restrictor passage connecting said common inlet manifold to said array of chambers, the first flow restrictor passage extending substantially the length of said array in said array direction
  • the present invention may be embodied in a printhead and, more specifically, an inkjet printhead.
  • Figure 7 shows a plan view of a cross-section of an inkjet printhead according to an embodiment of the present invention, the cross-section being taken perpendicular to the direction in which the array of fluid chambers (14) in the printhead extends.
  • each fluid chamber within the array is an elongate open- topped channel formed in the top surface of a strip of piezoelectric material, for example lead zirconium titanate (PZT).
  • PZT lead zirconium titanate
  • This strip of piezoelectric material is in turn provided on the edge surface of a substrate member (86), which is elongate in the array direction (100), extending beyond both ends of the array of fluid chambers (14).
  • the substrate member (86) may suitably be formed of a ceramic material, such as alumina.
  • Each of these fluid channels is therefore bounded by two elongate walls of piezoelectric material; the channels extend side-by-side in an array extending in the array direction (100).
  • Electrodes On opposite channel-facing surfaces of the piezoelectric walls are arranged electrodes to which voltages can be applied via connections provided on the side surfaces (34) of the substrate member (86). These side surfaces may be seen more clearly in Figure 8 , which is an isometric view of the cross-section shown in Figure 7 .
  • Application of an electric field between the electrodes on either side of a wall results in shear mode deflection of the wall into one of the flanking channels, which in turn generates a pressure pulse in that channel.
  • the channels are closed by a cover member in which are formed nozzles, each communicating with respective channels at the mid-points thereof.
  • Droplet release from the nozzles takes place in response to the aforementioned pressure pulse, as is well known in the art.
  • the direction in which droplets are ejected - the ejection direction (101) - is generally downwards in the drawing.
  • the substrate member (86) is elongate in this ejection direction (101).
  • the piezoelectric actuator members may be seen as being provided on the long "edge” of the substrate member (86), since the edge surface of the actuator block, in which the channels providing fluid chambers are formed, is defined by the longest and the shortest dimensions of the actuator block (which extend, respectively, in the array direction (100) and the chamber extension direction (102)). Accordingly, such embodiments may be referred to as “edge-shooters”, in contrast to embodiments where the fluid chambers are provided on the side surface (34) of a substrate member (86), which may typically be referred to as "side-shooters”.
  • the electrical connections on the side surfaces (34) of the substrate member (86) are provided by conductive tracks (192), which lead to integrated drive circuitry (84) disposed towards the top of the side surface (34).
  • a flexible connector extends away from the drive circuitry (84), as is shown in Figure 8 , so as to link the drive circuitry (84) with further electronic components not visible in Figure 8 .
  • the edges of the strip of piezoelectric material are chamfered.
  • This may simplify the provision of the channel electrodes and the conductive tracks (192) on the side surface (34): following the formation of the channels in the strip of piezoelectric material (for example by disc cutting), a metallic layer may be deposited over both the surfaces of the strip of piezoelectric material and the side surfaces (34) of the substrate member (86); this metallic layer may then be patterned appropriately, for example using a laser, so as to provide integrally formed channel electrodes and tracks (192).
  • the chamfer may enable the patterning of the edges of the strip of piezoelectric material to be carried out more accurately.
  • the printhead is provided with a single inlet manifold chamber (18) and a single outlet manifold chamber (19), which each extend the length of the array of fluid chambers (14) in the array direction (100) (generally into the paper in the drawing).
  • Each of the manifold chambers is common to all of the chambers within the array; each of the chambers is fluidically connected in series with all of the chambers in the array.
  • the inlet and outlet manifold chambers (19,18) are provided on either side of the substrate member (86) with respect to the array direction (100).
  • Figure 9 is an isometric view of the printhead of Figures 7 and 8 , with sections taken perpendicular to the array direction (100), as in Figures 7 and 8 , and an additional section taken along the length of the inlet manifold chamber (18).
  • the inlet manifold chamber (18) extends beyond the end of array of fluid chambers.
  • the outlet manifold chamber (19) in this embodiment also extends beyond the end of the array of fluid chambers. This may be found to reduce edge-effects, where there is greater variability in the properties of droplets deposited by those chambers towards the ends of the array.
  • inlet flow restrictor (28) passage that links the inlet manifold chamber (18) to the array of fluid chambers (14).
  • outlet flow restrictor (32) passage is also indicated in the drawing and links the array of chambers (14) to the outlet manifold chamber (19).
  • Both of these flow restrictor passages extend the length of the array of fluid chambers (14) and, as may be seen from the drawing, when a cross-section taken perpendicular to the array direction (100) is considered, they are relatively narrow in comparison to the manifold chambers and have an elongate cross-sectional shape.
  • the inlet flow restrictor passage (28) is connected to one longitudinal end of each of the chambers in the array (14) and the outlet flow restrictor passage (32) is connected to the other longitudinal end of each of the chambers in the array (14).
  • the flow restrictor passages are formed as elongate slots that extend in both the array direction (100) and the ejection direction (101). Such slots are relatively straightforward to form, for example by using moulded components or machining. Elongation of the flow restrictor passages in the ejection direction (101) (as opposed to the chamber extension direction (102)) may enable the size of the printhead in the direction of substrate movement to be decreased.
  • Figure 9 is also a cross-sectional view through the printhead shown in Figure 8 , but shows the flows of fluid during use of the printhead, when connected to a suitable fluid supply.
  • the flow (21, 22) in the inlet and outlet manifold chambers (19,18) is generally parallel to the array direction (100)
  • the flow (23, 24) in the flow restrictor passages is generally perpendicular to the array direction (100).
  • This is achieved by designing the flow restrictor passages so as to provide suitable impedance to fluid flow between the respective one of the inlet and outlet manifold chambers (19,18) and the array of fluid chambers (14).
  • the effect of this impedance is to "turn" the direction of fluid flow from one that is parallel to the array direction (100) to one that is perpendicular to the array direction (100). More particularly, the impedance is such that the fluid flow is perpendicular to the array direction (100) for substantially all the chambers within the array.
  • the overall flow path is therefore from the inlet manifold chamber (18), generally in a direction parallel to the array direction (100), then into the inlet flow restrictor (28), generally in a direction perpendicular to the array direction (100), then into the fluid chambers, generally in the chamber extensions direction. Fluid in excess of that required for droplet deposition then flows to the outlet flow restrictor (32) in a direction generally perpendicular to the array direction (100), before emerging into the outlet manifold chamber (19), where it returns to flowing generally in a direction parallel to the array direction (100), though in the opposite direction to the flow (21) in the inlet manifold chamber (18).
  • the impedance to fluid flow of the flow restrictor channels is achieved simply by a suitable choice of the width of the flow restrictor passage.
  • Apparatus with such flow restrictor passages are particularly straightforward to manufacture. More particularly, such flow restrictor passages may be formed with a high degree of accuracy over its length in the array direction (100) so as to have the desired effect on flow over the whole length in the array direction (100), which may be more difficult to achieve with more complex constructions.
  • protrusions or baffles within the flow restrictor passages may also be utilised to distribute the flow and/or alter the impedance of the flow restrictor passages.
  • Figures 10(a)-10(f) show the results of flow modelling tests carried out on the printhead design of Figures 8 and 9 . More particularly, the drawing shows the streamlines of the flow through the inlet manifold chamber (18), the inlet flow restrictor (28) passage and the array of fluid chambers (14) during use of the printhead. For clarity, these features are flattened in the diagram.
  • the effect of the inlet flow restrictor (28) is to cause fluid, which flows generally in the array direction (100) along the length of the inlet manifold chamber (18), to "turn” and be directed perpendicular to the array direction (100) as it approaches the array of fluid chambers (14).
  • the flow restrictor passage has a width of 300 microns, corresponding to an impedance of around 170 MPa/m 3 s -1 .
  • Figures 10(b)-10(f) then illustrate the results of similar modelling tests carried out on embodiments where the flow restrictor passage has a width of, respectively, 400, 500, 600 and 700 microns (corresponding, respectively, to impedances of around 91, 62, 49 and 42 MPa/m 3 s -1 ).
  • a flow restrictor passage with a width of less than 700 microns.
  • the ratio of the impedance over the length of the flow restrictor passage to the impedance over the length of the inlet manifold chamber (18) is approximately 1:85.
  • the pressure drop over the flow restrictor passage is even smaller in comparison to the pressure drop across the array of fluid chambers (14).
  • the ratio is approximately only 1:450.
  • the impedance of the flow restrictor is considerably less than that of the actuator. This may be contrasted with constructions disclosed in WO 2005/007415 , where the porous element provides the dominant pressure drop in a flow of fluid between the inlet manifold and the outlet manifold through an array of fluid chambers (14).
  • modelling tests indicate that the flow within the flow restrictor passage will begin to transition from laminar flow to turbulent flow. More particularly, modelling tests suggest that this transition begins to occur with passages having a width of less than 175 microns. This corresponds to a ratio for the impedance over the length of the flow restrictor passage to the impedance over the length of the inlet manifold chamber (18) of around 4:3, or an absolute impedance for the flow restrictor of 716 MPa/M 3 s -1 .
  • providing such a flow restrictor passage where the impedance is greater than 42 MPa/m 3 s -1 and/or less than 716 MPa/m 3 s -1 may be generally advantageous in terms of flow properties where such geometry is present, for the reasons discussed above.
  • providing a flow restrictor passage where the ratio of the impedance over its length to the impedance over the length of the manifold chamber is greater than 1:85 and/or less than 4:3 may also be advantageous more generally in embodiments with such geometry.
  • protrusions or baffles may be provided within flow restrictor passages to achieve such impedances and/or pressure drops.
  • the length and, more generally, the shape of the flow restrictor passage may be altered instead.
  • serpentine, or curved paths for the flow restrictor passage may be utilised, or ribs or ridges may be provided adjacent the flow restrictor passage, defining the shape of the passage.
  • Figure 11 is a side view, taken perpendicular to the array direction (100), of the component in which the manifold chambers are formed.
  • FIG 11 shows an ink inlet conduit (36), which is connected to the inlet manifold chamber (18) at one longitudinal end thereof. There is also shown an ink outlet conduit (42), which is connected to the outlet manifold chamber (19) at the opposite longitudinal end. This causes the flow (21) in the inlet manifold chamber (18) to be directed in substantially the opposite direction to the flow (22) in the outlet manifold chamber (19), as shown in Figure 9 and discussed above.
  • both the manifold chambers (18, 19) are tapered with respect to the array direction (100), though in opposite senses. This assists in ensuring that the same rate of flow is provided for all chambers within the array (14).
  • one or both of the flow restrictor passages (28, 32) might be tapered instead, or in addition.
  • providing a taper within the manifold chambers (18, 19) may assist with purging of the fluid chambers as part of a start-up mode for the apparatus.
  • the taper may ensure a roughly equal amount of fluid flow passes through each of the chambers in the array. This may, for example, reduce the likelihood of bubbles being trapped at the end of the array furthest from the point where enters the manifold.
  • the inlet and outlet conduits (36, 42) will be connected to a fluid supply system.
  • the ink supply system may apply a positive fluid pressure at the pipe connected as an inlet pipe and a negative pressure at the pipe connected as an outlet pipe, so as to drive a constant flow through the printhead.
  • the magnitude of the negative pressure may be somewhat greater than the magnitude of the positive pressure, so that a negative pressure (with respect to atmospheric pressure) is achieved at the nozzles, which may prevent fluid "weeping" from the nozzles during use.
  • both conduits (36,42) may be provided at the same end of the respective one of the manifold chambers (19,18).
  • Figure 12 is an isometric view of a manifold component where both conduits (36, 42) are provided at the same end.
  • Figure 13 which displays only certain interior components of the printhead of Figures 7, 8 , 9 and 11 , shows the configuration of the substrate member (86) more clearly.
  • the conductive tracks (192), which connect the channel wall electrodes to drive circuitry (84) and which are formed on the side surfaces (34) of the substrate member (86) are clearly displayed in the drawing.
  • the top surface of the strip of piezoelectric material, in which the fluid chambers are formed, is clearly visible in the drawing, as is the mounting surface, to which the nozzle plate (16) is attached.
  • Figure 13 further illustrates a printed circuit board having a number of electronic components provided thereupon and to which the drive circuitry (84) mounted on the side surfaces (34) of the substrate (86) are connected by means of flexible connector.
  • the printed circuit board is generally planar and extends in the array direction (100) and the ejection direction (101).
  • Figure 14 illustrates the fully assembled printhead (11), whose internal components are shown in Figures 7 to 9 and 11 and 13 . Owing to the relatively small thickness of the nozzle plate (16), the top surface of the piezoelectric strip, in which the array of ejection chambers (14) is formed, is visible therethrough.
  • piezoelectric actuator elements are provided by elongate piezoelectric wall elements that separate successive elongate channels
  • the present invention may be applied more broadly.
  • a variety of piezoelectric actuator elements may be utilised, such as those formed using thin-film techniques (for example, sol gel, or vapour deposition) and incorporated in a MEMS device.
  • thin-film techniques may be utilised to provide an array of piezoelectric actuator elements on the edge surface of the substrate member, though it will of course be appreciated that this particular geometry is by no means essential for implementing the present invention in a MEMS device.
  • thin-film piezoelectric actuator elements may be electrically connected to drive circuitry using interconnector tracks provided on the side surfaces of the substrate member.
  • diaphragm-type piezoelectric actuators may be utilised, which each include a body of piezoelectric material mounted on a diaphragm member that bounds a portion of a corresponding one of the fluid chambers.
  • the body of piezoelectric material is then actuable in response to electrical signals to cause the deformation of said diaphragm member so as to vary the volume of said corresponding one of the fluid chambers.
  • the diaphragm member may be generally planar and may be supported around a portion of, or substantially all of, a perimeter, while being substantially unsupported within said perimeter. In some constructions the diaphragm member will also bound a further chamber, in which the body of piezoelectric material is located.
  • a single, central inlet manifold chamber may be provided between two outlet manifold chambers.
  • this central inlet manifold may be connected to both arrays of fluid chambers with a single flow restrictor passage, or alternatively, respective flow restrictor passages can connect the inlet manifold to each array of fluid chambers.
  • the principles discussed above with regard to the flow restrictor passages may also be applied to apparatus having only an inlet manifold (so that there is no outlet manifold).
  • the flow restrictor passage will nonetheless present sufficient impedance to fluid flow such that, in use, fluid within the flow restrictor adjacent the array of chambers is directed generally perpendicular to the array direction for substantially all the chambers within the array.

Landscapes

  • Particle Formation And Scattering Control In Inkjet Printers (AREA)
  • Ink Jet (AREA)
EP15736025.6A 2014-07-02 2015-07-02 Droplet deposition apparatus Active EP3164268B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1411842.6A GB2527804B (en) 2014-07-02 2014-07-02 Droplet deposition apparatus
PCT/GB2015/051940 WO2016001679A1 (en) 2014-07-02 2015-07-02 Droplet deposition apparatus

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EP3164268A1 EP3164268A1 (en) 2017-05-10
EP3164268B1 true EP3164268B1 (en) 2020-12-09

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EP15736025.6A Active EP3164268B1 (en) 2014-07-02 2015-07-02 Droplet deposition apparatus

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US (1) US20170136770A1 (zh)
EP (1) EP3164268B1 (zh)
JP (1) JP2017521284A (zh)
CN (1) CN106573468B (zh)
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WO (1) WO2016001679A1 (zh)

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GB2554709A (en) * 2016-10-05 2018-04-11 Xaar Technology Ltd Droplet deposition head
GB2569090B (en) * 2017-09-25 2021-03-10 Xaar Technology Ltd Method, apparatus and circuitry for droplet deposition
WO2020112974A1 (en) 2018-11-28 2020-06-04 Schlumberger Technology Corporation Implicit property modeling

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Publication number Publication date
CN106573468A (zh) 2017-04-19
CN106573468B (zh) 2019-07-26
US20170136770A1 (en) 2017-05-18
JP2017521284A (ja) 2017-08-03
GB201411842D0 (en) 2014-08-13
EP3164268A1 (en) 2017-05-10
GB2527804A (en) 2016-01-06
WO2016001679A1 (en) 2016-01-07
GB2527804B (en) 2016-07-27

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